Malicious PDF — malware analysis report

Static analysis result for SHA-256 e7b4aa3e13567097…

MALICIOUS

PDF

78.0 KB Created: 2021-05-30 14:02:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-22
MD5: c30b30c2961465988c8358d52f500049 SHA-1: 289a4a9957446ff032d45df379ac94f44f70a694 SHA-256: e7b4aa3e13567097132e886c0a45816a8ad8cd7e006c4aabc640dad5794f831a
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains a large number of embedded external links, as indicated by the PDF_SEO_LINK_FARM heuristic. One prominent URL, https://ponafet.ru/strik?utm_term=geometry+dash+2.2+full+version+free+download+android, suggests a lure related to software downloads. The ClamAV detection and ML classifier strongly indicate malicious intent, likely phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://ponafet.ru/strik?utm_term=geometry+dash+2.2+full+version+free+download+android PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4495059/normal_600e30e09c7a6.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4491445/normal_605c6632b8a3a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4496216/normal_605f486aa99e8.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4471252/normal_60632db7e3df1.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4393911/normal_5fe34a373acf1.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369306/normal_603649e23c09f.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4492529/normal_600631502134d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4491969/normal_600c8db7bc8ce.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4426416/normal_5fc849048eee2.pdfIn PDF document text
    • https://wupovejiti.weebly.com/uploads/1/3/2/8/132814541/2366732.pdfIn PDF document text
    • https://jamibada.weebly.com/uploads/1/3/1/1/131164428/pujuresofuweg.pdfIn PDF document text
    • https://pekowemorexoxuk.weebly.com/uploads/1/3/1/3/131380284/c02b4f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4482218/normal_602517ee32d29.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4373797/normal_605285cd467f4.pdfIn PDF document text
    • https://paxiguvemogi.weebly.com/uploads/1/3/4/3/134317910/pilixomer.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4424996/normal_601e74f3a3d7d.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/99a91d9b-569a-4789-97e4-9af7b50909d4/appsc_group_1_mains_old_question_papers.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/15424a9e-5446-41be-8cf4-975eaee0d848/rofitoseviwajigojinigamo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4596718b-f7e2-4860-a304-b04bd3abf5b0/sozakugejopovezamikadad.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e8ee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE8EE 5596 bytes
SHA-256: c4d26f3ff02b430975614c9e1548e454a1671b17c740e5826beb92516e7083c7
font_01_sfnt_off0000fbef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFBEF 14804 bytes
SHA-256: 3a3c686ee16f6a9a645e7fc8c6ebf8910dd65333b926c3e34ff211bc263b32ad

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